Lvds (Low Voltage Differential Signal) refers to low voltage differential signal.

(P)ECL is a very important logic circuit in high-speed field. Its excellent characteristics make it widely used in high-speed computers, high-speed counters, digital communication systems, radars, measuring instruments and frequency synthesizers.

TTL and CMOS are common logic levels.

The following 15PF and 50PF are the matching loads of these output waveforms.